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          Bosch SR9521X - Starter

          MPN: SR9521X
          The Bosch SR9521X Starter ensures efficient engine ignition for BMW vehicles. Built to OEM standards, it offers durability and a straightforward installation.
          0.0
          Vehicle Specific
          Check if this part fits your vehicle.
          • $206.95 +$60.00 Core Charge
            Core Charge

            A core is some portion of a part that can be recycled or reused by the manufacturer. This helps to reduce product cost and is good for our environment. For this reason a product with a core has an additional charge associated with it. If the old part is returned in reusable condition, the core charge will be refunded.

          In stock

          Product Overview

          The Bosch Starter Motor part number SR9521X is a high-quality replacement part designed for BMW vehicles. Manufactured by Bosch, a trusted name in automotive parts, this starter motor ensures reliable and efficient performance, meeting or exceeding OEM standards. Engineered for various BMW models, it provides a dependable start every time you turn the key. Choose Bosch SR9521X for dependable performance and peace of mind every time you service your vehicle.

          Cross Reference Numbers

          This Bosch SR9521X is equivalent to or replaces the following part numbers: 12417631558, 12417631559.

          Vehicle Compatibility

          • BMW M2 3.0L6 (2016–2021)
          • BMW M3 3.0L6 (2016–2019)
          • BMW M4 3.0L6 (2016–2021)
          • BMW 640i 3.0L6 (2014–2019)
          • BMW X3 3.0L6 (2011–2016)
          • BMW X5 3.0L6 (2014–2018)
          • BMW X6 3.0L6 (2014–2018)
          • BMW 535i 3.0L6 (2014–2016)
          • BMW 740i 3.0L6 (2013–2015)
          • BMW ActiveHybrid 3 3.0L6 (2013–2015)

          This may also fits other applications. Please use the vehicle selector tool to verify fitment.

          Why Shop at eEuroparts.com?

          • Proven Expertise: Over 25 years of experience with European vehicles means we know your car inside and out.
          • Exclusive Kits That Fitâ„¢ - complete repair solutions with no guesswork
          • Fitment Confidence: Our accurate cataloging ensures you get the right part the first time.
          • Fast, Reliable Shipping: Orders ship quickly from our U.S.-based warehouses.
          • Transparent Pricing: Competitive prices with no hidden fees or surprise charges.
          • Established Trust: Serving the European auto community since 2000.

          Frequently Asked Questions

          What does the Bosch SR9521X Starter do?

          The starter motor is a critical component of your vehicle's ignition system. It engages the engine flywheel to start the combustion process, allowing your BMW to start smoothly and efficiently.

          How do I know if my Starter needs replacement?

          Key symptoms that may indicate a failing starter motor include:

          • Engine does not crank or starts intermittently.
          • Unusual clicking sounds when turning the ignition key.
          • Dashboard lights dimming while trying to start the engine.

          Can I install the Bosch SR9521X myself?

          Yes, the Bosch SR9521X is designed for easy installation, making it suitable for DIY enthusiasts. However, ensure you follow proper safety precautions and refer to your vehicle's service manual for specific instructions.

          What are the symptoms of a faulty Starter?

          Common symptoms of a faulty starter motor include difficulty starting the engine, grinding noises, or a complete failure to start. If you experience these issues, it is advisable to check the starter motor for faults.

          Why should I choose Bosch for my Starter needs?

          Bosch is known for its quality and reliability in the automotive industry. Order Bosch SR9521X today for a factory-correct replacement that restores safety and performance.

          Note: All information on this page and in the FAQ is for general reference only. Verify fitment and consult a professional as needed. eEuroparts.com is not responsible for incorrect part selection or installation.

            • eEuroparts SKU
              243529
            • Weight
              7.2047 lbs
            • Dimensions (L x W x H)
              11.8898 x 4.8819 x 6.9291 in
            • Barcode
              00077212170210
            • Manufacturer Part #
              SR9521X
          • Brand
            Bosch
          • Manufacturer
            Bosch
          • MPN
            SR9521X
          • Part Type
            Starter
          • OE Part Numbers
            12417631559, 12417631558
          • Features
            Mounting Hardware Included : No
            Mounting Shims Included : No
            New Or Remanufactured : Remanufactured
            Nose Cone Material : Aluminum
            Nose Cone Type : Closed Nose
            Power Rating : 1.5
            Prop 65 Warning Label Required? : No
            Solenoid Attached : Yes
            Starter Finish : Aluminum
            Starter Rotation : Clockwise
            Voltage : 12
          • Fitment
            • Fitment Type
              Vehicle Specific
          YearMakeModelSubmodelNotes
          2015BMW435i xDrive Gran CoupeBase (3.0 L6 GAS)
          2015BMWM235iBase (3.0 L6 GAS)
          2015BMWX6sDrive35i (3.0 L6 GAS)
          2015BMWX6xDrive35i (3.0 L6 GAS)
          2015BMWM3Base (3.0 L6 GAS)
          2015BMWM4Base (3.0 L6 GAS)
          2015BMW640i Gran CoupeBase (3.0 L6 GAS)
          2015BMW640i xDrive Gran CoupeBase (3.0 L6 GAS)
          2015BMW640iBase (3.0 L6 GAS)
          2015BMW640i xDriveBase (3.0 L6 GAS)
          2015BMWX3xDrive35i (3.0 L6 GAS)
          2015BMW435iBase (3.0 L6 GAS)Transmission Control: Automatic
          2015BMW435i xDriveBase (3.0 L6 GAS)Transmission Control: Automatic
          2015BMW435i Gran CoupeBase (3.0 L6 GAS)
          2015BMWActiveHybrid 3Base (3.0 L6 FHEV)
          2015BMW740iBase (3.0 L6 GAS)Notes: with 1.5 Kilowatt Starter
          2015BMW740LiBase (3.0 L6 GAS)Notes: with 1.5 Kilowatt Starter
          2015BMW740Li xDriveBase (3.0 L6 GAS)
          2015BMWM235i xDriveBase (3.0 L6 GAS)
          2015BMW335iBase (3.0 L6 GAS)Transmission Control: Automatic, Notes: with Start/Stop Feature
          2015BMW335i GT xDriveBase (3.0 L6 GAS)Notes: with Start/Stop Feature
          2015BMW335i xDriveBase (3.0 L6 GAS)Transmission Control: Automatic, Notes: with Start/Stop Feature
          2015BMW535iBase (3.0 L6 GAS)Transmission Control: Automatic
          2015BMW535i xDriveBase (3.0 L6 GAS)
          2015BMW535i GTBase (3.0 L6 GAS)
          2015BMW535i GT xDriveBase (3.0 L6 GAS)
          2015BMWX4xDrive35i (3.0 L6 GAS)
          2015BMWX5sDrive35i (3.0 L6 GAS)
          2015BMWX5xDrive35d (3.0 L6 DIESEL)
          2015BMWX5xDrive35i (3.0 L6 GAS)
          2016BMW435i xDrive Gran CoupeBase (3.0 L6 GAS)
          2016BMWX6sDrive35i (3.0 L6 GAS)
          2016BMWX6xDrive35i (3.0 L6 GAS)
          2016BMWM235iBase (3.0 L6 GAS)
          2016BMWM235i xDriveBase (3.0 L6 GAS)
          2016BMWM2Base (3.0 L6 GAS)
          2016BMW640iBase (3.0 L6 GAS)
          2016BMW640i Gran CoupeBase (3.0 L6 GAS)
          2016BMW640i xDriveBase (3.0 L6 GAS)
          2016BMW640i xDrive Gran CoupeBase (3.0 L6 GAS)
          2016BMW435iBase (3.0 L6 GAS)Transmission Control: Automatic
          2016BMW435i Gran CoupeBase (3.0 L6 GAS)
          2016BMW435i xDriveBase (3.0 L6 GAS)Transmission Control: Automatic
          2016BMWX3xDrive35i (3.0 L6 GAS)
          2016BMWX4M40i (3.0 L6 GAS)
          2016BMWX4xDrive35i (3.0 L6 GAS)
          2016BMWX5sDrive35i (3.0 L6 GAS)
          2016BMWX5xDrive35d (3.0 L6 DIESEL)
          2016BMWX5xDrive35i (3.0 L6 GAS)
          2016BMWM4Base (3.0 L6 GAS)
          2017BMWX6sDrive35i (3.0 L6 GAS)
          2017BMWX6xDrive35i (3.0 L6 GAS)
          2017BMWM2Base (3.0 L6 GAS)
          2018BMWM3Base (3.0 L6 GAS)
          2018BMWM2Base (3.0 L6 GAS)
          2018BMWM4Base (3.0 L6 GAS)
          2018BMW640iBase (3.0 L6 GAS)
          2018BMW640i xDriveBase (3.0 L6 GAS)
          2018BMW640i Gran CoupeBase (3.0 L6 GAS)
          2018BMW640i xDrive Gran CoupeBase (3.0 L6 GAS)
          2018BMWX6sDrive35i (3.0 L6 GAS)
          2018BMWX6xDrive35i (3.0 L6 GAS)
          2019BMW640i xDrive Gran CoupeBase (3.0 L6 GAS)
          2019BMWM4Base (3.0 L6 GAS)
          2019BMWM4CS (3.0 L6 GAS)
          2019BMWX6sDrive35i (3.0 L6 GAS)
          2019BMWX6xDrive35i (3.0 L6 GAS)
          2019BMW640i Gran CoupeBase (3.0 L6 GAS)
          2011BMWX3xDrive28i (3.0 L6 GAS)
          2011BMWX3xDrive35i (3.0 L6 GAS)
          2012BMWX3xDrive28i (3.0 L6 GAS)
          2012BMWX3xDrive35i (3.0 L6 GAS)
          2013BMW640i Gran CoupeBase (3.0 L6 GAS)
          2013BMWX3xDrive35i (3.0 L6 GAS)
          2013BMW740LiBase (3.0 L6 GAS)Notes: with 1.5 Kilowatt Starter
          2013BMW740iBase (3.0 L6 GAS)Notes: with 1.5 Kilowatt Starter
          2013BMWActiveHybrid 3Base (3.0 L6 FHEV)
          2013BMW740Li xDriveBase (3.0 L6 GAS)
          2013BMW640iBase (3.0 L6 GAS)
          2014BMWX3xDrive35i (3.0 L6 GAS)
          2014BMW640i Gran CoupeBase (3.0 L6 GAS)
          2014BMW640iBase (3.0 L6 GAS)
          2014BMW640i xDriveBase (3.0 L6 GAS)
          2014BMW640i xDrive Gran CoupeBase (3.0 L6 GAS)
          2014BMW740iBase (3.0 L6 GAS)Notes: with 1.5 Kilowatt Starter
          2014BMW740LiBase (3.0 L6 GAS)Notes: with 1.5 Kilowatt Starter
          2014BMW740Li xDriveBase (3.0 L6 GAS)
          2014BMW435iBase (3.0 L6 GAS)Transmission Control: Automatic, Notes: with Start/Stop Feature
          2014BMW435i xDriveBase (3.0 L6 GAS)Transmission Control: Automatic, Notes: with Start/Stop Feature
          2014BMW335iBase (3.0 L6 GAS)Transmission Control: Automatic, Notes: with Start/Stop Feature
          2014BMW535i GTBase (3.0 L6 GAS)
          2014BMW535i GT xDriveBase (3.0 L6 GAS)
          2014BMW535iBase (3.0 L6 GAS)Transmission Control: Automatic
          2014BMW535i xDriveBase (3.0 L6 GAS)
          2014BMWActiveHybrid 3Base (3.0 L6 FHEV)Notes: with Start/Stop Feature
          2014BMW335i xDriveBase (3.0 L6 GAS)Transmission Control: Automatic, Notes: with Start/Stop Feature
          2014BMW335i GT xDriveBase (3.0 L6 GAS)Notes: with Start/Stop Feature
          2014BMWX5sDrive35i (3.0 L6 GAS)
          2014BMWX5xDrive35d (3.0 L6 DIESEL)
          2014BMWX5xDrive35i (3.0 L6 GAS)
          There are more vehicles this part is compatible with. Check if it fits your vehicle.
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          Warranty Overview

          At eEuroparts, we stand behind the quality of the products we sell. Every part we offer is backed by a warranty designed to give you peace of mind and protect your investment.

          Standard Warranty – Most Parts

          • Coverage: 2 years or 24,000 miles (whichever comes first) from purchase date.

          • Protection: Defects in materials or workmanship under normal personal use.

          • Eligibility: Applies only to the original purchaser and the vehicle where the part was first installed.

          • Exclusions:

            • Wear-and-tear items (brake pads, filters, bulbs, wipers, etc.)

            • Commercial, fleet, rideshare, off-road, or racing use

            • Improper installation, misuse, accidents, or modifications

          • Not Covered: Labor, shipping, towing, or incidental costs.

          Bison Performance Warranty – Our House Brand

          • Coverage: Limited Lifetime Warranty for as long as you own your vehicle.

          • Applies To: All products sold under the Bison Performance label.

          • Premium Protection: Goes beyond our standard warranty — if it’s a Bison product, the 2-year/24k mile limit is replaced with lifetime coverage.

          • Exclusions: Same as the standard warranty (normal wear, commercial use, improper installation, etc.).

          • What’s Included: Replacement of the defective product (labor and shipping excluded).

          Warranty Claim Requirements

          To keep claims fast and fair, we require:

          • Proof of purchase (invoice or order confirmation).

          • Photos or videos showing the defective part, order number, date, VIN, and odometer reading.

          • Diagnostic reports or part returns for non-visible issues may be requested.

          • Claims must be truthful, properly documented, and reflect normal consumer use.

          Buy With Confidence: We back our products because we believe in their quality, with a transparent, customer-first warranty process you can trust. And with Bison Performance products, you’ll enjoy Limited Lifetime protection—an assurance few brands can match.

          For full details and exclusions, please see our complete Warranty Terms & Conditions.

          This summary is for convenience only. For full warranty coverage details, exclusions, and requirements, see our official Warranty Terms & Conditions. In case of conflict, the full policy governs.

          Return Policy Overview

          Most parts can be returned within 30 days of delivery if unused, uninstalled, and in original packaging.
          To start a return, contact customer support via Chat or Contact Us.

          • Restocking fee: Up to 20% may apply for certain orders (buyer’s remorse, order errors, or special-order items)

          • Refunds: Issued to your original payment method within 3–5 business days after inspection

          • Exchanges: Not automatic — please return and reorder

          • Replacements: May be approved for incorrect or defective items reported within 7 days

          Not returnable:

          • Used or installed parts

          • Electrical components

          • Opened filter kits, gaskets, or contaminated items

          • Final sale or custom orders

          Important Notes:

          • Return shipping is your responsibility unless we made a verified error

          • Fitment is the customer’s responsibility (we can assist, but do not guarantee)

          • Country of origin may vary and is not grounds for return

          For complete details, please see our full Return Policy.


          This Returns summary is provided for convenience only. All returns, refunds, and exchanges are subject to the complete Returns Policy. In the event of any conflict, the full policy governs.

          Fast, Reliable Shipping — Straight to Your Door

          We ship most orders the same day when placed before 2 PM CST (Monday–Friday). Our main warehouse is just east of Nashville, TN, and we also ship from multiple locations nationwide to get your order to you as quickly as possible.

          • We use trusted carriers like UPS, FedEx, and USPS.

          • Tracking info is emailed to you as soon as your order ships.

          • Delivery estimates at checkout are based on carrier data, but not guaranteed.

          Need help with a shipment?

          If your order is missing, damaged, or incorrect, just let us know within 5 days of delivery. We’ll walk you through the quick claim process — including a few photos to help us make things right.

          For complete details, please see our full Shipping Policy.


          This Shipping summary is provided for convenience only. Delivery times, carrier terms, fees, restrictions, risk of loss, and other details are governed by our complete Shipping Policy. In the event of any conflict, the full policy governs.

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